I have Pirelli PZero z rated tires and do not have such problems. They have been on my car for 6k miles and still have tons of tread left. How much mileage are you putting on them and how hard are you driving?
Boxsters are supposed to have negative camber, resulting in slightly faster wear on the inside of the tires. How are they wearing out on your car. Have you taken the car to an alignment shop? Maybe there is something really out of wack, but I'd think you would notice if something major. I can't imagine that you drive that hard all the time that they would wear out that often,, but maybe you do!
Larez2
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